Large-eddy simulation of flows over random urban-like obstacles
Large-eddy simulation of flows over random urban-like obstacles
Further to our previous large-eddy simulation (LES) of flow over a staggered array of uniform cubes, a simulation of flow over random urban-like obstacles is presented. To gain a deeper insight into the effects of randomness in the obstacle topology, the current results, e.g. spatially-averaged mean velocity, Reynolds stresses, turbulence kinetic energy and dispersive stresses, are compared with our previous LES data and direct numerical simulation data of flow over uniform cubes. Significantly different features in the turbulence statistics are observed within and immediately above the canopy, although there are some similarities in the spatially-averaged statistics. It is also found that the relatively high pressures on the tallest buildings generate contributions to the total surface drag that are far in excess of their proportionate frontal area within the array. Details of the turbulence characteristics (like the stress anisotropy) are compared with those in regular roughness arrays and attempts to find some generality in the turbulence statistics within the canopy region are discussed.
generality of turbulence statistics, large-eddy simulation, randomness, urban canopy
1-23
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Coceal, Omduth
c89d9de1-c311-4203-b6ea-b72eb48fa4f9
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
October 2008
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Coceal, Omduth
c89d9de1-c311-4203-b6ea-b72eb48fa4f9
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
Xie, Zheng-Tong, Coceal, Omduth and Castro, Ian P.
(2008)
Large-eddy simulation of flows over random urban-like obstacles.
Boundary-Layer Meteorology, 129 (1), .
(doi:10.1007/s10546-008-9290-1).
Abstract
Further to our previous large-eddy simulation (LES) of flow over a staggered array of uniform cubes, a simulation of flow over random urban-like obstacles is presented. To gain a deeper insight into the effects of randomness in the obstacle topology, the current results, e.g. spatially-averaged mean velocity, Reynolds stresses, turbulence kinetic energy and dispersive stresses, are compared with our previous LES data and direct numerical simulation data of flow over uniform cubes. Significantly different features in the turbulence statistics are observed within and immediately above the canopy, although there are some similarities in the spatially-averaged statistics. It is also found that the relatively high pressures on the tallest buildings generate contributions to the total surface drag that are far in excess of their proportionate frontal area within the array. Details of the turbulence characteristics (like the stress anisotropy) are compared with those in regular roughness arrays and attempts to find some generality in the turbulence statistics within the canopy region are discussed.
Text
large-eddy_simulation_of_flows_over_random_urban_like_obstacles.pdf
- Accepted Manuscript
More information
Submitted date: 24 September 2007
Published date: October 2008
Keywords:
generality of turbulence statistics, large-eddy simulation, randomness, urban canopy
Organisations:
Aerodynamics & Flight Mechanics
Identifiers
Local EPrints ID: 58997
URI: http://eprints.soton.ac.uk/id/eprint/58997
ISSN: 0006-8314
PURE UUID: 5e0d6839-3393-4fcb-825d-5b2878acebbb
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Date deposited: 21 Aug 2008
Last modified: 16 Mar 2024 03:40
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Author:
Omduth Coceal
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